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Author Topic: ALL PHYSICS DOUBTS - POST HERE !!  (Read 230489 times)

Offline Weaam

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2220 on: May 26, 2010, 09:05:33 pm »
What is meant by an electromotive force of 12V
O/N 08 Q8 part C second varient.
thaaaaank yoou!
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Offline Ghost Of Highbury

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2221 on: May 26, 2010, 09:06:55 pm »
okay, im off guyz. 1:30 am !  ::)

Good luck to y'all !! Hope you do well!

Sorry if its early to leave , but i have to go, 1:30 am here!!

@weaam = Attached. Green - Air, Black = Dust. Imagine all those collisions taking place. They simply cant fall down
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Offline Weaam

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2222 on: May 26, 2010, 09:09:54 pm »
Quote from: A@di on May 26, 2010, 09:06:55 pm
okay, im off guyz. 1:30 am !  ::)

Good luck to y'all !! Hope you do well!

Sorry if its early to leave , but i have to go, 1:30 am here!!

@weaam = Attached. Green - Air, Black = Dust. Imagine all those collisions taking place. They simply cant fall down
Im not even gunna try and draw that but thanks anywaays  :D
and goood luck!
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- The man who smiles when things go wrong has thought of someone to blame it on. - Robert Bloch.
-I saw weird stuff in that place last night. Weird, strange, sick, twisted, eerie, godless, evil stuff... and I went in. - Homer
+ Rep me if i have been of any assistance to you ;D

Offline Shazizzzle

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2223 on: May 26, 2010, 09:15:01 pm »
Quote from: weaam on May 26, 2010, 09:05:33 pm
What is meant by an electromotive force of 12V
O/N 08 Q8 part C second varient.
thaaaaank yoou!

The electromotive force of any battery is the amount of energy in joules provided to each coloumb (C) of charge, as it passes through the circuit.

So, the electromotive force of 12 V would mean,
the battery provides 12 J of energy to each coloumb (C) of charge as it passes through the circuit.
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Offline Helium

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2224 on: May 26, 2010, 09:17:50 pm »
Quote from: weaam on May 26, 2010, 09:05:33 pm
What is meant by an electromotive force of 12V
O/N 08 Q8 part C second varient.
thaaaaank yoou!

A cell (or battery) pushes electrons round a circuit.
It is a kind of electron pump.Different cells can exert different electrical pressures.
This electrical pressure is called electromotive force or e.m.f and it is measured in volts(V).

Extracted From (Physics for you).
 ;)

hope u understand
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Offline Weaam

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2225 on: May 26, 2010, 09:25:05 pm »
Quote from: Shazizzzle on May 26, 2010, 09:15:01 pm
The electromotive force of any battery is the amount of energy in joules provided to each coloumb (C) of charge, as it passes through the circuit.

So, the electromotive force of 12 V would mean,
the battery provides 12 J of energy to each coloumb (C) of charge as it passes through the circuit.
Thaaaaanks ssoo muuch!
That was great help!  ;)
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- The man who smiles when things go wrong has thought of someone to blame it on. - Robert Bloch.
-I saw weird stuff in that place last night. Weird, strange, sick, twisted, eerie, godless, evil stuff... and I went in. - Homer
+ Rep me if i have been of any assistance to you ;D

Offline Weaam

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2226 on: May 26, 2010, 09:26:00 pm »
Quote from: Helium on May 26, 2010, 09:17:50 pm
A cell (or battery) pushes electrons round a circuit.
It is a kind of electron pump.Different cells can exert different electrical pressures.
This electrical pressure is called electromotive force or e.m.f and it is measured in volts(V).

Extracted From (Physics for you).
 ;)

hope u understand

Its not reaally clear, but i kinda got it, thanks anyway!  ;D
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- The man who smiles when things go wrong has thought of someone to blame it on. - Robert Bloch.
-I saw weird stuff in that place last night. Weird, strange, sick, twisted, eerie, godless, evil stuff... and I went in. - Homer
+ Rep me if i have been of any assistance to you ;D

Offline Shazizzzle

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2227 on: May 26, 2010, 09:36:45 pm »
Okay, a few more things.

When experimenting latent heat of fusion, the mass taken into consideration is the mass of the MELTED ICE i.e THE WATER FORMED, right?

And, when experimenting latent heat of vaporisation, the mass taken into consideration is the MASS OF THE STEAM FORMED, in other words, (final mass of beaker + water after experiment) - (initial mass of beaker + water before experiment), right? ???
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Offline red_911

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2228 on: May 26, 2010, 09:49:21 pm »
hey can anyone explain me question 9(C) (2) ? ??? 0625/31/M/J/08
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Offline blackberry

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2229 on: May 26, 2010, 09:52:42 pm »
PLZZZZZ HELP!!!!!!!!!!!!!!

how can we reduce power loss in relation to resistance?? decrease or increase?
and wat r de methods for changing resistance in relation to length,thickness,area,temp etc of wire?
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Offline Baladya

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2230 on: May 26, 2010, 09:54:25 pm »
http://www.freeexampapers.us/IGCSE/Physics/CIE/2009%20Nov/0625_w09_qp_31.pdf
Can u plzz help, m totally stuck at this question and need to understand it fully cuz if i dont then m *** up tommorow :S

10)c)d)e)
first at C) how can we get Energy when we dont have time?
Then i get confused by the repeating stuff in the other questions

plz explain in a simple way cuz  m confused :S

Thankssss :)
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Offline Baladya

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2231 on: May 26, 2010, 09:55:56 pm »
Quote from: blackberry on May 26, 2010, 09:52:42 pm
PLZZZZZ HELP!!!!!!!!!!!!!!

how can we reduce power loss in relation to resistance?? decrease or increase?
and wat r de methods for changing resistance in relation to length,thickness,area,temp etc of wire?

Decrease

And what do u mean?? just get a thinner and thicker wire (if thats ur question). But there is no method in doing that 0.o
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Offline red_911

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2232 on: May 26, 2010, 09:56:15 pm »
Quote from: Shazizzzle on May 26, 2010, 09:36:45 pm
Okay, a few more things.

When experimenting latent heat of fusion, the mass taken into consideration is the mass of the MELTED ICE i.e THE WATER FORMED, right?

And, when experimenting latent heat of vaporisation, the mass taken into consideration is the MASS OF THE STEAM FORMED, in other words, (final mass of beaker + water after experiment) - (initial mass of beaker + water before experiment), right? ???
yeah u r right
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Offline blackberry

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2233 on: May 26, 2010, 10:00:10 pm »
Quote from: Baladya on May 26, 2010, 09:55:56 pm
Decrease

And what do u mean?? just get a thinner and thicker wire (if thats ur question). But there is no method in doing that 0.o

like increasing the length of the wire increases resistance so what does increasin thickness of wire do?
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Offline diva_sparkles

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2234 on: May 26, 2010, 10:01:54 pm »
Quote from: blackberry on May 26, 2010, 10:00:10 pm
like increasing the length of the wire increases resistance so what does increasin thickness of wire do?

decreases resistance n 4 temp it depends on da material eg semiconductors n metals
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